No, I mean the actual MV lenses themselves turn yellow. I used white glue to install 3 of the clear MV lenses into the nose gear of my SU-30, and it worked awesome, and the glue dried crystal clear.

At the time of installation, the MV Lenses themselves were also crystal clear too. FF 6 years to the 2017 US Nationals, and after being in my display case for years without me actually noticing, on the contest table at the NATs last year I finally noticed all 3 clear MV lenses were now all amber colored.

I haven't really noticed any color changes with the pre-colored red/green/amber MV lenses.